Brake mechanism.



A. J. O'BRIEN. BRAKE MECHANISM.

APPLICATION FILED AUG. 21, 1912.

lfig lfi u v Patented M9127, 191A 5 2 SHEETS-SHEET 1.

7 6 jlllllli d famfi WITNESSES: 4 H INVE/VTOR 7/ v 9. W m flaiaerd. C3 5?) mm W M By MWLWM 4 TTOR/VEV A. J. OBRIEN.

BRAKE MECHANISM.

\APPLIOATION FILED AUG. 21, 1912.

LUQQ I 62%, Patented Aprfi, 19m

2 SHEETS-SHEET 2. M R 20 ll TTOR/VEY ASHER J. OBRIEN, OF SEATTLE, WASHINGTON.

BRAKE MECHANISM.

Specification of Letters Patent.

Patented Apr. '7, 1914.

Application filed August 21, 1912. Serial No. 716,228.

citizen of the United States, residing at Seattle, in the county of King and State of Washington, have invented a certain new and useful Improvement in Brake Mechanism, of which the following is a specification.

This invention relates to brake mechanism.

and fire fighting apparatus, and that shall be strong, effective, readily controlled and shall require the application oflittle force in its operation.

I attain these objects by devices illustrated by the accompanying drawings, 1n which:

Figure 1 is a view in side elevat on, partly in section, of a structure embodylng the invention, the section being taken on the line YY, Fig. 5. Figs. 2 and 3 are erspective views of details of the brake. Fig. 4 is a view in side elevation, partly in section, of a modified form of a detail of the brake. Fig. 5 is a view in vertical longitudinal section taken on the line X-X,

Fig. 1. Fig. 6 is a perspective detail view of an element of the brake. Fig. 7 is a View in side elevation of a part of the brake.

Like reference numerals indicate like parts throughout the drawings.

disk 12 provided with a projecting brake rim 13. The inner surface of the brakerim 13 is concentric with the axle 10 and may serve as. a friction surface withwhlch brake-shoes 14 may engage, the latter being faced with green-hide or leather 24 which may be replaced from time to time as it wears away. While two brake-shoes are shown in Figs. 1 and 5, agreater number might be employed with advantage in larger sizes of brakes. The brake-shoes14,- disposed within the brake-rim 13 to engage with the inner surface thereof, are connected by links 15 with lugs 16 which project from a hub 17 that is loosely mounted on axle 10, as shown more clearly in Fig. 12 The length of links 15 are such that when the hub 17 is turned in a direction indicated bv the arrow, in Fig. 1, the brake-shoes 14 are thrust against the inner surface of the brake-rim 13.

Mounted freely on the axle 10 adjacent to the brake-shoes 14 is a holding-plate 18 which is rigidly secured and prevented from turning by means of stay-rods 19 which are connected by bolts 20 each to lugs 21 disposed adjacent to opposite edges of and integral with the holding plate 18 from which lugs 21 the stay-rods 19 may extend to the running-gear of a truck'not shown.

The holding-plate 18. is provided with projecting studs 22 of square cross-section which extend from its sides into rectangular recesses 23 which are formed in bosses 22 integral with the brake-shoes 1.4, the construction of which brake-shoes 14 is more 14 each is provided on its concave side with a web 25 and to afford means for connecting the link 15 with the brake-shoes 14 there is formed on each side of said web 25 a boss 26 through which extends a hole 27 wherein may be disposed the link-pin 28.

One of the links 15 is shown in perspec.- tive in Fig. 3 and in such link the distance between the center of the holes in its respective ends is a fixed distance allowing no adjustment or change of distance between the hub 17 and the link-pin 28 to compensate for the wearing away of the brake-shoe 14 but such adjustment in many cases may be unnecessary. If, however, it be desired, a modified form of link may be substituted for the link 15 and I have shown-one modified form of such link in Fig. 4'wherein an adjustable link comprising two parts 29 and 30, respectively, the part 29 being adapted to connect with the brake-shoe 14 and provided with a shank 31 adapted by a screw-thread to screw into the part 30 which is adapted to be connected to the lugs 16 on the hub 17 whereby a half turn of the screw-thread will cause the length of such .modified form of links to be changed.

From one end of the hub 17 extends an arm 32 through an opening 33 in the holdextend from the end of the arm 32, to which it is articulated, by pivot-pin 35,to a brakelever, not shown, of some well known form.

Figs. 1 and 7 clearly show the relative positions of the arm 32, brake-rod 34 and the hub 17, dotted lines in Fig. 1 indicating said arm 32 and brake-rod 34, and such F igsal and 7 make obvious the mode of operation of my invention wherein when the brakerod 34 is caused to act on the arm 32 to move the hub 17in the direction of the arrow shown in/Fig. 1 then the links 15 communicate pressure against the brake-shoes 14 to exert great friction between such brakeshoes 14 and the brake-rim 13 thus tending to'i mpede the rotary motion of the brakerim '13 and the wheel-hub 9 to which it is bolted, while a movement of said-brake-rod 34 which, acts tocause the arm 32 to move the hub in an opposite direction, may withdraw the brake-shoes 14 from engagement with said brake-rim 13 in an obvious manner. Outwardly projecting strengthening ribs 40 are provided upon the outer face of,

the holding plate 18 and these substantially connect the opposite ends of the lugs 21and provide'a circular-inclosure or bearing 41 for the axle 10 while an interrupted portion is provided with the opposite shoulders 42 which act as stops for the opening and closing movement of the lever 32. Thus the wheel of a vehicle when associated with a structure containing my invention, as shown, may be fully controlled by a brakelever or other suitable device acting to opcrate the brake-rod 34 and, moreover, the

brake-shoes 14, links 15, hub 17 and holding-plate 18 may be embodied in afriction clutch device that is adapted to 'communicured to said hub, a holding plate closing-1y positioned within said rim .and provided with an opening for receiving said axle thcrethrough, means for rigidly securlng said holding plate to the vehicle, a plurality of brake shoes disposed within said rim, lugs positioned upon the inner face of said plate, housings provided upon said shoes and having recesses therein for slidably-receiving said plate lugs, a. turn-hub upon said axle, lever meansbetween said hub and shoes, rearwardly-extending flanges radially positioned upon the outer face of said plate, acircular flange adapted for journaling said axle, an off-set lever arm secured to said turn-hub and extending outwardly of said plate and between saidflanges thereof, and interrupted stop members for limiting the movement of said lever arm.

In witness whereof, I, hereunto subscribe my name this 23rd day. of July A. D., 1912.

ASHER J. OBRIEN. Witnesses 3 A. J. SPEGKERT, A. EKLUND. 

